HP 8642A Operation And Calibration Manual page 30

Installation Model 8642A/B
2-2
I
WARNINGI
This
is
a Safety Class I product (ie., provided with a protective earth
terminal). An lIninterruptible safety earth ground must be provided from
the Mains power source to the product input wiring terminals, power
cord,
01'
slipplied power cord set. Whenever it
is
likely that the protection
has been impaired, the instrument must be made inoperative and be
secured against any unintended operation.
If this instrument is to be energi<.ed via an external autotransformer for
voltage reduction, make sure that the common terminal
is
connected to
the earthed pole of the power source.
BEFORE PLUGGING THIS INSTRUMENT into the Mains (line)
voltage, be sure the correct voltage and fuse have been selected.
A rear-panel, line power module permits operation from I DO, 120, 220, or 240 Vac. The
number visible in the window (located on the module) indicates the nominal line voltage to
which the instrument must be connected. Verify that the line voltage selection card and the fuse
are matched to the power source. Refer to Figure 2-1, Line Voltage and Fuse Selection.
Two fuses are supplied with each instrument. One fuse has the proper rating for 110/120 Vac
line operation (lIP part number 2110-0003; 3A, 2S0V, non-time-delay). The other fuse is rated
for 200/220 Vac operation (HP part number 2110-0002; 2A, 2S0V, non-time-delay).
One fuse is installed in the instrument at the time of shipment. The rating of the installed fuse
is selected according to the line voltage specified by the customer. If the voltage is not specified,
the rating of the installed fuse will be selected according to the country
of
destination.
I
WARNINcj
For protection against fire hazard, the line fuse should only be a 250V
normal blow fuse with the correct current rating.